Genetic structure and evolution of diploid<i>Cochlearia</i>in Iceland

Abstract In northern European Cochlearia (Brassicaceae), considerable chromosome variation has taken place without corresponding morphological differentiation, resulting in an intricate species complex including two base numbers and several ploidies. Here, we investigate the situation Iceland. The distribution, genetic structure, taxonomy origin of cytotypes (2n = 12 2n 14) present Iceland are discussed. Chromosome counts indicate that both occur along coast, but populations dominate (eight vs. 14 among investigated populations), whereas was reported for inland alpine here. RADseq data support geographically structured Icelandic coast environmentally differentiation between coastal populations. show affiliation with C. groenlandica 14), which is widely distributed Arctic, more comprehensive sampling needed to draw conclusions concerning taxonomic status plants. To uncover phylogenomic relationships variants, comparative whole-genome sequencing should be performed.